CN115060320A - Power lithium battery production quality on-line monitoring and analyzing system based on machine vision - Google Patents
Power lithium battery production quality on-line monitoring and analyzing system based on machine vision Download PDFInfo
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Abstract
The invention discloses a machine vision-based online monitoring and analyzing system for production quality of a power lithium battery. Realized the monitoring to a plurality of dimensions of finished product lithium cell on the one hand, can effectively embody the comprehensive production quality of finished product lithium cell, overcome among the prior art that the face relies on apparent quality monitoring result to judge whether qualified and the judgement limitation that leads to of production, promoted the detection precision and the quality supervision level of finished product lithium cell greatly. On the other hand, the workload of detection personnel is effectively reduced, the body load of the detection personnel is greatly relieved, and the manual detection cost is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of power lithium battery production quality monitoring, and particularly relates to a power lithium battery production quality on-line monitoring and analyzing system based on machine vision.
Background
With the continuous development of science and technology and economy, the application range of the lithium battery is wider and wider, the lithium battery is widely applied to a plurality of manufacturing fields such as electronic products, new energy technology and the like, the demand of the society for the lithium battery is expanded continuously, and therefore higher requirements are provided for the production quality of the lithium battery. Under the condition, the production quality monitoring of the lithium battery is particularly important.
In recent years, traditional manual checking modes are mostly adopted for monitoring the production quality of lithium batteries, great working pressure is brought to detection personnel, the problems that the monitoring is not in place, the working efficiency is low and the like can exist, meanwhile, the detection dimensionality of finished lithium batteries is single, and the detection dimensionality is embodied in the following aspects:
(1) by adopting a traditional manual checking mode, on one hand, detection personnel face huge workload of finished lithium battery production quality detection every day, and also need to feed back detection results, so that great load is brought to a body, and on the other hand, the manual detection cost is also increased;
(2) from prior art, the quality detection of finished lithium batteries mostly only focuses on the apparent quality of the finished lithium batteries, such as size and appearance defects, the attention degree of the performance detection of the finished lithium batteries is low, so that the detection of the finished lithium batteries is too complete, the comprehensive production quality of the finished lithium batteries cannot be embodied, and the situations of low detection accuracy and quality supervision level of the finished lithium batteries are caused.
Disclosure of Invention
In order to overcome the defects in the background art, the embodiment of the invention provides an online monitoring and analyzing system for the production quality of a power lithium battery based on machine vision, which can effectively solve the problems related to the background art.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a machine vision-based power lithium battery production quality online monitoring and analyzing system, which comprises an apparent quality monitoring module, a charging interface quality monitoring module, a charging performance quality monitoring module, a database, a comprehensive production quality analyzing module and a display terminal, wherein the apparent quality monitoring module is connected with the charging interface quality monitoring module;
the comprehensive production quality analysis module is respectively connected with the apparent quality monitoring module, the charging interface quality monitoring module, the charging performance quality monitoring module, the database and the display terminal;
the apparent quality monitoring module is used for monitoring the apparent quality of the finished lithium battery, and comprises a size quality monitoring unit, a weight quality monitoring unit and an appearance quality monitoring unit;
the charging interface quality monitoring module is used for monitoring the charging interface quality of the finished lithium battery, and comprises a charging interface position quality monitoring unit, a charging interface size quality monitoring unit and a charging interface appearance quality monitoring unit;
the charging performance quality monitoring module is used for monitoring the charging performance quality of the finished lithium battery, and comprises a charging electricity quality monitoring unit and a charging temperature quality monitoring unit;
the database is used for storing standard size parameters, standard weights, standard three-dimensional appearance images, finished product appearance defect allowable areas, standard charging interface position three-dimensional coordinates, standard charging interface dimension specification parameters, standard charging interface three-dimensional appearance images, charging interface appearance defect allowable areas, standard charging voltages, standard charging currents and standard charging electric quantities corresponding to the types of finished lithium batteries, and storing standard charging temperature change curves;
the comprehensive production quality analysis module is used for evaluating the comprehensive production quality coefficient of the finished lithium battery based on the apparent quality monitoring result, the charging interface quality monitoring result and the charging performance quality monitoring result of the finished lithium battery;
and the display terminal is used for displaying the comprehensive production quality coefficient of the finished lithium battery.
As a preferred scheme, the size and quality monitoring unit is used for detecting the quality of the external dimensions of the finished lithium battery, and the specific detection process comprises the following steps:
a1, detecting the size parameters of the finished lithium battery, wherein the size parameters comprise length, width and height;
a2, comparing the size parameters of the finished lithium battery with the standard size parameters corresponding to the model of the finished lithium battery in the database, and calculating the finished lithium batteryThe corresponding external dimension conformity of the battery is calculated by the following formula:
lambda is expressed as the corresponding external dimension conformity of the finished lithium battery, l 0 、w 0 And h 0 Respectively representing the standard length, the standard width and the standard height corresponding to the model of the finished lithium battery, and l, w and h respectively representing the length, the width and the height of the finished lithium battery.
As a preferred scheme, the weight and quality monitoring unit is used for performing quality detection on the weight of the finished lithium battery, and the specific detection comprises the following steps:
b1, carrying out weight detection on the finished lithium battery;
b2, comparing the weight of the finished lithium battery with the standard weight corresponding to the model of the finished lithium battery in the database, and calculating the weight and mass conformity of the finished lithium battery, wherein the calculation formula is as follows:
wherein beta is expressed as the corresponding weight mass conformity, k, of the finished lithium battery 0 Expressed as the standard weight corresponding to the model of the finished lithium battery, and k is expressed as the weight of the finished lithium battery.
As a preferred scheme, the appearance quality monitoring unit is used for detecting the appearance of the finished lithium battery, and the specific detection comprises the following steps:
c1, acquiring three-dimensional appearance images of the finished lithium battery by using a high-definition camera;
c2, comparing the three-dimensional appearance image of the finished lithium battery with a standard three-dimensional appearance image corresponding to the model of the finished lithium battery in the database, judging whether the finished lithium battery has defects, if so, positioning an appearance defect area from the three-dimensional appearance image, and extracting the defect area of the appearance defects of the finished lithium battery;
c3, comparing the area of the appearance defect of the finished lithium battery with the allowable area of the appearance defect of the finished lithium battery preset in the database, calculating the conformity of the appearance quality of the finished lithium battery,the calculation formula is as follows:
wherein delta is expressed as the appearance quality conformity of the finished lithium battery, s 0 The allowable area of the finished product appearance defect corresponding to the type of the finished lithium battery is represented, and s is the area of the appearance defect of the finished lithium battery.
As a preferred scheme, the charging interface position quality monitoring unit is used for performing quality detection on the charging interface position of the lithium battery, and the specific detection comprises the following steps:
d1, establishing a three-dimensional coordinate system of the finished lithium battery;
d2, positioning the three-dimensional coordinate of the charging interface position from the three-dimensional appearance image of the finished lithium battery based on the established three-dimensional coordinate system;
d3, comparing the three-dimensional coordinates of the charging interface position of the finished lithium battery with the three-dimensional coordinates of the standard charging interface position corresponding to the model of the finished lithium battery in the database, and calculating the setting conformity of the charging interface position corresponding to the finished lithium battery, wherein the calculation formula is as follows:
mu represents the conformity, x, of the charging interface position of the finished lithium battery 0 、y 0 And z 0 And the three-dimensional coordinate values of the standard charging interface positions on the x axis, the y axis and the z axis corresponding to the model of the finished lithium battery are respectively expressed, and the three-dimensional coordinate values of the charging interface positions of the finished lithium battery on the x axis, the y axis and the z axis are respectively expressed.
As a preferred scheme, the charging interface dimension and quality monitoring unit is used for performing quality detection on the dimension and specification of the charging interface of the finished lithium battery, and the specific detection comprises the following steps:
e1, detecting the size and specification parameters of the charging interface of the finished lithium battery, wherein the size parameters comprise diameter and protrusion height;
e2 Standard gauge corresponding to the charging interface dimension specification parameters of the finished lithium battery and the model of the finished lithium battery in the databaseThe grid parameters are compared, the charge interface outline dimension conformity corresponding to the finished lithium battery is calculated, and the calculation formula is as follows:
wherein sigma is expressed as the conformity of the external dimension of the charging interface of the finished lithium battery, and d 0 And g 0 The standard charging interface diameter and the standard charging interface protrusion height corresponding to the model of the finished lithium battery are respectively represented, and d and g are respectively represented as the diameter and the protrusion height of the finished lithium battery charging interface.
As a preferred scheme, the charging interface appearance quality monitoring unit is used for detecting the appearance quality of a charging interface of a finished lithium battery, and the specific detection comprises the following steps:
f1, extracting a three-dimensional appearance image of the finished lithium battery charging interface from the acquired three-dimensional appearance image of the finished lithium battery;
f2, comparing the three-dimensional appearance image of the finished lithium battery charging interface with the three-dimensional appearance image of the standard charging interface corresponding to the model of the finished lithium battery in the database, judging whether the finished lithium battery charging interface has defects, if so, positioning an appearance defect area from the three-dimensional appearance image, and extracting the defect area of the appearance defects of the finished lithium battery charging interface;
f3, comparing the charging interface appearance defect area of the finished lithium battery with a charging interface appearance defect allowable area preset in a database, and calculating the charging interface appearance quality conformity of the finished lithium battery, wherein the calculation formula is as follows:
wherein alpha is expressed as the appearance quality conformity of the charging interface of the finished lithium battery, r 0 And the allowable area of the appearance defect of the charging interface of the type to which the finished lithium battery belongs is represented, and r is the area of the appearance defect of the charging interface of the finished lithium battery.
As a preferred scheme, the charging electricity quality monitoring unit is used for detecting the charging electricity quality of the finished lithium battery, and the specific detection steps are as follows:
g1, performing charging operation on the finished lithium battery, dividing the charging process according to preset intervals to obtain a plurality of charging time points, and extracting the charging voltage, the charging current and the charging electric quantity of the finished lithium battery at each charging time point;
g2, comparing the charging voltage, the charging current and the charging electric quantity of the finished lithium battery at each charging time point with the standard charging voltage, the standard charging current and the standard charging electric quantity of the model of the finished lithium battery stored in the database at each charging time point, and calculating the fluctuation value of the charging operation parameter corresponding to the finished lithium battery, wherein the calculation formula is as follows:
wherein xi is expressed as the fluctuation value of the charging operation parameter of the finished lithium battery, U 0 、I 0 And P 0 Respectively representing the standard charging voltage, the standard charging current and the standard charging capacity corresponding to each charging time point of the preset finished lithium battery, and U, I and P respectively representing the charging voltage, the charging current and the charging capacity of the finished lithium battery at each charging time point.
As a preferred scheme, the charging temperature quality monitoring unit is used for detecting the charging temperature quality of the finished lithium battery, and the specific detection steps are as follows:
h1, collecting the charging temperature of the finished lithium battery at each charging time point;
h2, drawing a charging temperature change curve of the finished lithium battery by taking the charging time point as an abscissa and the charging temperature as an ordinate;
h3, coincidence comparison is carried out on the charging temperature change curve of the finished lithium battery and a standard charging temperature change curve corresponding to the model of the finished lithium battery stored in the database, the coincident curve length is extracted, and the conformity of the charging temperature change curve corresponding to the finished lithium battery is calculated, wherein the calculation formula is
Wherein
The curve conformity of the charging temperature variation of the finished lithium battery is expressed, F is the length of the coincidence of the charging temperature variation of the finished lithium battery, and F is the length of the standard charging temperature variation curve corresponding to the model of the finished lithium battery.
As a preferred scheme, the corresponding comprehensive production quality coefficient of the finished lithium battery is as follows:
wherein eta is expressed as the corresponding comprehensive production quality coefficient of the finished lithium battery.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
(1) according to the invention, the production quality of the finished lithium battery is monitored and analyzed on line based on machine vision, and compared with the traditional manual checking mode, the workload of detection personnel can be effectively reduced, the body load of the detection personnel is greatly reduced, and the manual detection cost is greatly reduced.
(2) The invention judges whether the production quality of the finished lithium battery is qualified or not through the comprehensive production quality coefficient of the finished lithium battery obtained based on the apparent quality monitoring, the charging interface quality monitoring and the charging performance quality monitoring of the finished lithium battery. The method not only comprises the apparent quality monitoring of the finished lithium battery, but also comprises the charging interface quality monitoring and the charging performance quality monitoring of the finished lithium battery, and realizes the monitoring of multiple dimensions of the finished lithium battery. On the one hand, the comprehensive production quality of the finished lithium battery can be effectively embodied, and on the other hand, the judgment limitation caused by judging whether production is qualified or not by the aid of the apparent quality monitoring result of the sheet surface in the prior art is overcome, so that the detection accuracy and the quality supervision level of the finished lithium battery are improved.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
Fig. 1 is a schematic diagram of the system connection structure of the present invention.
FIG. 2 is a schematic view of the apparent mass monitoring module connections of the present invention.
Fig. 3 is a schematic connection diagram of the charging interface quality monitoring module according to the present invention.
Fig. 4 is a schematic diagram of a charging performance quality monitoring module according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention provides an online monitoring and analyzing system for the production quality of a power lithium battery based on machine vision, which comprises an apparent quality monitoring module, a charging interface quality monitoring module, a charging performance quality monitoring module, a database, a comprehensive production quality analyzing module and a display terminal.
The comprehensive production quality analysis module is respectively connected with the apparent quality monitoring module, the charging interface quality monitoring module, the charging performance quality monitoring module, the database and the display terminal.
And the apparent mass monitoring module is used for monitoring the apparent mass of the finished lithium battery to obtain the corresponding overall dimension conformity, weight mass conformity and appearance mass conformity of the finished lithium battery.
Referring to fig. 2, the apparent mass monitoring module includes a size mass monitoring unit, a weight mass monitoring unit, and an appearance mass monitoring unit;
specifically, the size and quality monitoring unit is used for detecting the quality of the external dimensions of the finished lithium battery, and the specific detection process comprises the following steps:
a1, detecting the size parameters of the finished lithium battery, wherein the size parameters comprise length, width and height;
a2, comparing the size parameters of the finished lithium battery with the standard size parameters corresponding to the model of the finished lithium battery in the database, and calculating the corresponding outline dimension conformity of the finished lithium battery, wherein the calculation formula is as follows:
lambda is the corresponding contour dimension conformity of the finished lithium battery, l 0 、w 0 And h 0 Respectively representing the standard length, the standard width and the standard height corresponding to the model of the finished lithium battery, and l, w and h respectively representing the length, the width and the height of the finished lithium battery.
It should be noted that, in the above formula for calculating the conformity between the external dimensions, the smaller the difference between the length, width and height of a certain finished lithium battery and the standard length, standard width and standard height corresponding to the model to which the finished lithium battery belongs is, the greater the conformity between the external dimensions of the finished lithium battery is, which indicates that the quality of the external dimensions of the finished lithium battery conforms to the standard.
Specifically, the weight and quality monitoring unit is used for carrying out quality detection on the weight of the finished lithium battery, and the specific detection comprises the following steps:
b1, carrying out weight detection on the finished lithium battery;
b2, comparing the weight of the finished lithium battery with the standard weight corresponding to the model of the finished lithium battery in the database, and calculating the weight and mass conformity of the finished lithium battery, wherein the calculation formula is as follows:
wherein beta is expressed as the corresponding weight mass conformity, k, of the finished lithium battery 0 Expressed as the standard weight corresponding to the model of the finished lithium battery, and k is expressed as the weight of the finished lithium battery.
It should be noted that, in the above formula for calculating the weight-mass conformity, the smaller the difference between the weight of a certain finished lithium battery and the standard weight corresponding to the model to which the finished lithium battery belongs, the greater the weight-mass conformity corresponding to the finished lithium battery, which indicates that the weight-mass of the finished lithium battery conforms to the standard.
Specifically, the appearance quality monitoring unit is used for detecting the appearance of the finished lithium battery, and the specific detection comprises the following steps:
c1, acquiring three-dimensional appearance images of the finished lithium battery by using a high-definition camera;
c2, comparing the three-dimensional appearance image of the finished lithium battery with a standard three-dimensional appearance image row corresponding to the model of the finished lithium battery in the database, judging whether the finished lithium battery has defects, if so, positioning an appearance defect area from the three-dimensional appearance image, and extracting the defect area of the appearance defects of the finished lithium battery;
c3, comparing the area of the appearance defect of the finished lithium battery with the allowable area of the appearance defect of the finished lithium battery preset in the database, and calculating the appearance quality conformity of the finished lithium battery, wherein the calculation formula is as follows:
wherein delta is expressed as the appearance quality conformity of the finished lithium battery, s 0 The allowable area of the finished product appearance defect corresponding to the type of the finished lithium battery is represented, and s is the area of the appearance defect of the finished lithium battery.
It should be noted that, in the above formula for calculating the conformity between the appearance quality and the size of the finished product lithium battery, the smaller the difference between the area of the appearance defect of a certain finished lithium battery and the allowable area of the finished product appearance defect corresponding to the type of the finished lithium battery, the greater the conformity between the appearance quality and the size of the finished lithium battery, which indicates that the appearance quality of the finished lithium battery conforms to the standard.
The charging interface quality monitoring module is used for monitoring the charging interface quality of the finished lithium battery, and the charging interface position corresponding to the finished lithium battery is obtained to be set in conformity, the charging interface outline dimension conformity and the charging interface appearance quality conformity.
Referring to fig. 3, the charging interface quality monitoring module includes a charging interface position quality monitoring unit, a charging interface size quality monitoring unit, and a charging interface appearance quality monitoring unit.
Specifically, the charging interface position quality monitoring unit is used for performing quality detection on the charging interface position of the lithium battery, and the detection specifically comprises the following steps:
d1, establishing a three-dimensional coordinate system of the finished lithium battery;
d2, positioning three-dimensional coordinates of the charging interface position from the three-dimensional appearance image of the finished lithium battery based on the established three-dimensional coordinate system;
d3, comparing the three-dimensional coordinates of the charging interface position of the finished lithium battery with the three-dimensional coordinates of the standard charging interface position corresponding to the model of the finished lithium battery in the database, and calculating the setting conformity of the charging interface position corresponding to the finished lithium battery, wherein the calculation formula is as follows:
mu wherein is expressed as a charging interface position setting conformity degree, x, of the finished lithium battery 0 、y 0 And z 0 And the three-dimensional coordinate values of the standard charging interface positions on the x axis, the y axis and the z axis corresponding to the model of the finished lithium battery are respectively expressed, and the three-dimensional coordinate values of the charging interface positions of the finished lithium battery on the x axis, the y axis and the z axis are respectively expressed.
It should be noted that, in the above calculation formula for the conformity of the charging interface position settings, the smaller the difference between the three-dimensional coordinate values of the charging interface position of a finished lithium battery on the x-axis, the y-axis and the z-axis and the three-dimensional coordinate values of the standard charging interface position on the x-axis, the y-axis and the z-axis corresponding to the model of the finished lithium battery is, the larger the conformity of the charging interface position settings of the finished lithium battery is, which indicates that the quality of the charging interface position of the finished lithium battery is more in accordance with the standard.
Specifically, the charging interface dimension and quality monitoring unit is used for performing quality detection on the dimension and specification of the charging interface of the finished lithium battery, and the specific detection comprises the following steps:
e1, detecting the size and specification parameters of the charging interface of the finished lithium battery, wherein the size parameters comprise the diameter and the height of the bulge;
e2 specification parameters and data of charging interface of finished lithium batteryStandard dimension specification parameters corresponding to the types of the finished lithium batteries in the library are compared, and the external dimension conformity of the charging interface corresponding to the finished lithium batteries is calculated by the following calculation formula:
wherein sigma is expressed as the conformity of the external dimension of the charging interface of the finished lithium battery, and d 0 And g 0 The standard charging interface diameter and the standard charging interface protrusion height corresponding to the model of the finished lithium battery are respectively represented, and d and g are respectively represented as the diameter and the protrusion height of the finished lithium battery charging interface.
It should be noted that, in the above calculation formula for the conformity of the external dimensions of the charging interface, the smaller the difference between the diameter and the protrusion height of the charging interface of a certain finished lithium battery and the difference between the diameter and the protrusion height of the standard charging interface corresponding to the model to which the finished lithium battery belongs, the larger the conformity of the external dimensions of the charging interface corresponding to the finished lithium battery, and the more the dimensional quality of the charging interface of the finished lithium battery conforms to the standard.
Specifically, the charging interface appearance quality monitoring unit is used for detecting the appearance quality of a charging interface of a finished lithium battery, and the specific detection comprises the following steps:
f1, extracting a three-dimensional appearance image of the finished lithium battery charging interface from the acquired three-dimensional appearance image of the finished lithium battery;
f2, comparing the three-dimensional appearance image of the finished lithium battery charging interface with the three-dimensional appearance image of the standard charging interface corresponding to the model of the finished lithium battery in the database, judging whether the finished lithium battery charging interface has defects, if so, positioning an appearance defect area from the three-dimensional appearance image, and extracting the defect area of the appearance defects of the finished lithium battery charging interface;
f3, comparing the charging interface appearance defect area of the finished lithium battery with a charging interface appearance defect allowable area preset in a database, and calculating the charging interface appearance quality conformity of the finished lithium battery, wherein the calculation formula is as follows:
wherein alpha is expressed as the appearance quality conformity of the charging interface of the finished lithium battery, r 0 And the allowable area of the appearance defect of the charging interface of the type to which the finished lithium battery belongs is represented, and r is the area of the appearance defect of the charging interface of the finished lithium battery.
It should be noted that, in the above calculation formula for the conformity of the appearance quality of the charging interface, the smaller the difference between the area of the appearance defect of the charging interface of a certain finished lithium battery and the allowable area of the appearance defect of the charging interface of the type to which the finished lithium battery belongs, the larger the conformity of the appearance quality of the charging interface corresponding to the finished lithium battery is, the more the appearance quality of the charging interface of the finished lithium battery conforms to the standard.
The charging performance quality monitoring module is used for monitoring the charging performance quality of the finished lithium battery to obtain the corresponding charging operation parameter fluctuation value and the corresponding charging temperature change curve conformity of the finished lithium battery.
Referring to fig. 4, the charging performance quality monitoring module includes a charging electrical quality monitoring unit and a charging temperature quality monitoring unit.
Specifically, the charging electricity quality monitoring unit is used for detecting the charging electricity quality of the finished lithium battery, and the detection steps are as follows:
g1, performing charging operation on the finished lithium battery, dividing the charging process according to preset intervals to obtain a plurality of charging time points, and extracting the charging voltage, the charging current and the charging electric quantity of the finished lithium battery at each charging time point;
g2, comparing the charging voltage, the charging current and the charging electric quantity of the finished lithium battery at each charging time point with the standard charging voltage, the standard charging current and the standard charging electric quantity of the model of the finished lithium battery stored in the database at each charging time point, and calculating the fluctuation value of the charging operation parameter corresponding to the finished lithium battery, wherein the calculation formula is as follows:
wherein xi is expressed as the fluctuation value of the charging operation parameter of the finished lithium battery, U 0 、I 0 And P 0 Respectively representing the standard charging voltage, the standard charging current and the standard charging capacity corresponding to each charging time point of the preset finished lithium battery, and U, I and P respectively representing the charging voltage, the charging current and the charging capacity of the finished lithium battery at each charging time point.
It should be noted that, in the above calculation formula of fluctuation values of charging operation parameters, the smaller the difference between the charging voltage and the charging current of a certain finished product lithium battery at each charging time point and the charging voltage, the charging current and the charging amount of the preset finished product lithium battery at each charging time point is, the smaller the fluctuation value of charging operation parameters corresponding to the finished product lithium battery is, the more the charging electricity quality of the finished product lithium battery meets the standard.
Specifically, the charging temperature quality monitoring unit is used for detecting the charging temperature quality of the finished lithium battery, and the detection steps are as follows:
h1, collecting the charging temperature of the finished lithium battery at each charging time point;
h2, drawing a charging temperature change curve of the finished lithium battery by taking the charging time point as an abscissa and the charging temperature as an ordinate;
h3, coincidence comparison is carried out on the charging temperature change curve of the finished lithium battery and a standard charging temperature change curve corresponding to the model of the finished lithium battery stored in the database, the coincident curve length is extracted, and the conformity of the charging temperature change curve corresponding to the finished lithium battery is calculated, wherein the calculation formula is
Wherein
The curve conformity of the charging temperature variation of the finished lithium battery is expressed, F is the length of the coincidence of the charging temperature variation of the finished lithium battery, and F is the length of the standard charging temperature variation curve corresponding to the model of the finished lithium battery.
It should be noted that, in the above calculation formula for the coincidence degree of the charging temperature variation curves, the larger the ratio of the coincidence length of the charging temperature variation curves extracted from a certain finished lithium battery to the length of the temperature variation curve corresponding to the model to which the finished lithium battery belongs is, the larger the coincidence degree of the charging temperature variation curves corresponding to the finished lithium battery is, which indicates that the charging temperature quality of the finished lithium battery is more in accordance with the standard.
The database is used for storing standard size parameters, standard weights, standard three-dimensional appearance images, finished product appearance defect allowable areas, standard charging interface position three-dimensional coordinates, standard charging interface dimension specification parameters, standard charging interface three-dimensional appearance images, charging interface appearance defect allowable areas, standard charging voltages, standard charging currents and standard charging electric quantities at all charging time points, and storing standard charging temperature change curves, wherein the standard size parameters, the standard weights, the standard three-dimensional appearance images, the finished product appearance defect allowable areas, the standard charging interface position three-dimensional coordinates, the standard charging interface dimension specification parameters, the standard charging interface three-dimensional appearance images, the charging interface appearance defect allowable areas, the standard charging voltages, the standard charging currents and the standard charging electric quantities correspond to the types of finished lithium batteries.
And the comprehensive production quality analysis module is used for evaluating the comprehensive production quality coefficient of the finished lithium battery based on the apparent quality monitoring result, the charging interface quality monitoring result and the charging performance quality monitoring result of the finished lithium battery.
Specifically, the calculation formula of the comprehensive production quality coefficient corresponding to the finished lithium battery is as follows:
wherein eta is expressed as the corresponding comprehensive production quality coefficient of the finished lithium battery.
It should be noted that, in the above formula for calculating the comprehensive production quality coefficient corresponding to the finished lithium battery, the larger the calculated comprehensive production quality coefficient of the finished lithium battery is, the more the production quality of the finished lithium battery meets the standard.
The embodiment of the invention evaluates whether the finished lithium battery is qualified for production or not based on the apparent quality monitoring result, the charging interface quality monitoring result and the charging performance quality monitoring result of the finished lithium battery, not only comprises the apparent quality monitoring of the finished lithium battery, but also comprises the charging interface quality monitoring and the charging performance quality monitoring of the finished lithium battery, and realizes the multi-dimension monitoring of the finished lithium battery. On the one hand, the comprehensive production quality of the finished lithium battery can be effectively embodied, and on the other hand, the judgment limitation caused by judging whether production is qualified or not by the aid of the apparent quality monitoring result of the sheet surface in the prior art is overcome, so that the detection accuracy and the quality supervision level of the finished lithium battery are improved.
The display terminal is used for displaying the comprehensive production quality coefficient of the finished lithium battery, provides a visual interface for the detection personnel, enables the detection personnel to visually know whether the finished lithium battery meets the qualified standard, not only enables the detection personnel to clearly and visually know the comprehensive production quality of the finished lithium battery, but also effectively reduces the workload of the detection personnel, greatly relieves the physical load of the detection personnel, and greatly reduces the manual detection cost.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the invention as defined in the following claims.
Claims (10)
1. The utility model provides a power lithium cell production quality on-line monitoring analytic system based on machine vision which characterized in that includes: the system comprises an apparent quality monitoring module, a charging interface quality monitoring module, a charging performance quality monitoring module, a database, a comprehensive production quality analysis module and a display terminal;
the comprehensive production quality analysis module is respectively connected with the apparent quality monitoring module, the charging interface quality monitoring module, the charging performance quality monitoring module, the database and the display terminal;
the apparent quality monitoring module is used for monitoring the apparent quality of the finished lithium battery, and comprises a size quality monitoring unit, a weight quality monitoring unit and an appearance quality monitoring unit;
the charging interface quality monitoring module is used for monitoring the charging interface quality of the finished lithium battery, and comprises a charging interface position quality monitoring unit, a charging interface size quality monitoring unit and a charging interface appearance quality monitoring unit;
the charging performance quality monitoring module is used for monitoring the charging performance quality of the finished lithium battery, and comprises a charging electricity quality monitoring unit and a charging temperature quality monitoring unit;
the database is used for storing standard size parameters, standard weights, standard three-dimensional appearance images, finished product appearance defect allowable areas, standard charging interface position three-dimensional coordinates, standard charging interface dimension specification parameters, standard charging interface three-dimensional appearance images, charging interface appearance defect allowable areas, standard charging voltages, standard charging currents and standard charging electric quantities at all charging time points, and storing standard charging temperature change curves, wherein the standard size parameters, the standard weights, the standard three-dimensional appearance images, the finished product appearance defect allowable areas, the standard charging interface position three-dimensional coordinates, the standard charging interface dimension specification parameters, the standard charging interface three-dimensional appearance images, the charging interface appearance defect allowable areas, the standard charging voltages, the standard charging currents and the standard charging electric quantities correspond to the types of finished lithium batteries;
the comprehensive production quality analysis module is used for evaluating the comprehensive production quality coefficient of the finished lithium battery based on the apparent quality monitoring result, the charging interface quality monitoring result and the charging performance quality monitoring result of the finished lithium battery;
and the display terminal is used for displaying the comprehensive production quality coefficient of the finished lithium battery.
2. The machine vision-based power lithium battery production quality online monitoring and analyzing system of claim 1, characterized in that: the size and quality monitoring unit is used for detecting the quality of the overall size of the finished lithium battery, and the specific detection process comprises the following steps:
a1, detecting the size parameters of the finished lithium battery, wherein the size parameters comprise length, width and height;
a2, comparing the size parameters of the finished lithium battery with the standard size parameters corresponding to the model of the finished lithium battery in the database, and calculating the corresponding outline dimension conformity of the finished lithium battery, wherein the calculation formula is as follows:
lambda is expressed as the corresponding external dimension conformity of the finished lithium battery, l 0 、w 0 And h 0 Respectively representAnd l, w and h respectively represent the length, the width and the height of the finished lithium battery.
3. The machine vision-based power lithium battery production quality online monitoring and analyzing system of claim 1, characterized in that: the weight and quality monitoring unit is used for carrying out quality detection on the weight of the finished lithium battery, and the specific detection comprises the following steps:
b1, carrying out weight detection on the finished lithium battery;
b2, comparing the weight of the finished lithium battery with the standard weight corresponding to the model of the finished lithium battery in the database, and calculating the weight and mass conformity of the finished lithium battery, wherein the calculation formula is as follows:
wherein beta is expressed as the corresponding weight mass conformity, k, of the finished lithium battery 0 Expressed as the standard weight corresponding to the model of the finished lithium battery, and k is expressed as the weight of the finished lithium battery.
4. The machine vision-based power lithium battery production quality online monitoring and analyzing system of claim 1, characterized in that: the appearance quality monitoring unit is used for detecting the appearance of the finished lithium battery, and the specific detection comprises the following steps:
c1, acquiring three-dimensional appearance images of the finished lithium battery by using a high-definition camera;
c2, comparing the three-dimensional appearance image of the finished lithium battery with a standard three-dimensional appearance image row corresponding to the model of the finished lithium battery in the database, judging whether the finished lithium battery has defects, if so, positioning an appearance defect area from the three-dimensional appearance image, and extracting the defect area of the appearance defects of the finished lithium battery;
c3, comparing the area of the appearance defect of the finished lithium battery with the allowable area of the appearance defect of the finished lithium battery preset in the database, and calculating the appearance quality symbol of the finished lithium batteryThe degree of contact, its computational formula is:
wherein delta is expressed as the appearance quality conformity of the finished lithium battery, s 0 The allowable area of the finished product appearance defect corresponding to the type of the finished lithium battery is represented, and s is the area of the appearance defect of the finished lithium battery.
5. The machine vision-based power lithium battery production quality online monitoring and analyzing system of claim 1, characterized in that: the charging interface position quality monitoring unit is used for carrying out quality detection on the charging interface position of the lithium battery, and the specific detection comprises the following steps:
d1, establishing a three-dimensional coordinate system of the finished lithium battery;
d2, positioning three-dimensional coordinates of the charging interface position from the three-dimensional appearance image of the finished lithium battery based on the established three-dimensional coordinate system;
d3, comparing the three-dimensional coordinates of the charging interface position of the finished lithium battery with the three-dimensional coordinates of the standard charging interface position corresponding to the model of the finished lithium battery in the database, and calculating the setting conformity of the charging interface position corresponding to the finished lithium battery, wherein the calculation formula is as follows:
mu wherein the setting conformity, x, of the charging interface position of the finished lithium battery 0 、y 0 And z 0 And the three-dimensional coordinate values of the standard charging interface positions on the x axis, the y axis and the z axis corresponding to the model of the finished lithium battery are respectively expressed, and the three-dimensional coordinate values of the charging interface positions of the finished lithium battery on the x axis, the y axis and the z axis are respectively expressed.
6. The machine vision-based power lithium battery production quality online monitoring and analyzing system of claim 1, characterized in that: the charging interface size and quality monitoring unit is used for carrying out quality detection on the charging interface size and specification of the finished lithium battery, and the specific detection comprises the following steps:
e1, detecting the size and specification parameters of the charging interface of the finished lithium battery, wherein the size parameters comprise diameter and protrusion height;
e2, comparing the dimension specification parameters of the charging interface of the finished lithium battery with the standard dimension specification parameters corresponding to the model of the finished lithium battery in the database, and calculating the contour dimension conformity of the charging interface corresponding to the finished lithium battery, wherein the calculation formula is as follows:
wherein sigma is expressed as the conformity of the external dimension of the charging interface of the finished lithium battery, and d 0 And g 0 The standard charging interface diameter and the standard charging interface protrusion height corresponding to the model of the finished lithium battery are respectively represented, and d and g are respectively represented as the diameter and the protrusion height of the finished lithium battery charging interface.
7. The machine vision-based power lithium battery production quality online monitoring and analyzing system of claim 1, characterized in that: the charging interface appearance quality monitoring unit is used for detecting the appearance quality of a charging interface of a finished lithium battery, and the specific detection comprises the following steps:
f1, extracting a three-dimensional appearance image of the finished lithium battery charging interface from the acquired three-dimensional appearance image of the finished lithium battery;
f2, comparing the three-dimensional appearance image of the finished lithium battery charging interface with the three-dimensional appearance image of the standard charging interface corresponding to the model of the finished lithium battery in the database, judging whether the finished lithium battery charging interface has defects, if so, positioning an appearance defect area from the three-dimensional appearance image, and extracting the defect area of the appearance defects of the finished lithium battery charging interface;
f3, comparing the charging interface appearance defect area of the finished lithium battery with a charging interface appearance defect allowable area preset in a database, and calculating the charging interface appearance quality conformity of the finished lithium battery, wherein the calculation formula is as follows:
wherein alpha is expressed as the appearance quality conformity of the charging interface of the finished lithium battery, r 0 And the allowable area of the appearance defect of the charging interface of the type to which the finished lithium battery belongs is represented, and r is the area of the appearance defect of the charging interface of the finished lithium battery.
8. The machine vision-based power lithium battery production quality online monitoring and analyzing system of claim 1, characterized in that: the charging electricity quality monitoring unit is used for detecting the charging electricity quality of the finished lithium battery, and the specific detection steps are as follows:
g1, performing charging operation on the finished lithium battery, dividing the charging process according to preset intervals to obtain a plurality of charging time points, and extracting the charging voltage, the charging current and the charging electric quantity of the finished lithium battery at each charging time point;
g2, comparing the charging voltage, the charging current and the charging electric quantity of the finished lithium battery at each charging time point with the standard charging voltage, the standard charging current and the standard charging electric quantity of the model of the finished lithium battery stored in the database at each charging time point, and calculating the fluctuation value of the charging operation parameter corresponding to the finished lithium battery, wherein the calculation formula is as follows:
wherein xi is expressed as the fluctuation value of the charging operation parameter of the finished lithium battery, U 0 、I 0 And P 0 Respectively representing the standard charging voltage, the standard charging current and the standard charging capacity corresponding to each charging time point of the preset finished lithium battery, and U, I and P respectively representing the charging voltage, the charging current and the charging capacity of the finished lithium battery at each charging time point.
9. The machine vision-based power lithium battery production quality online monitoring and analyzing system of claim 1, characterized in that: the charging temperature quality monitoring unit is used for detecting the charging temperature quality of finished lithium batteries, and the specific detection steps are as follows:
h1, collecting the charging temperature of the finished lithium battery at each charging time point;
h2, drawing a charging temperature change curve of the finished lithium battery by taking the charging time point as an abscissa and the charging temperature as an ordinate;
h3, coincidence comparison is carried out on the charging temperature change curve of the finished lithium battery and a standard charging temperature change curve corresponding to the model of the finished lithium battery stored in the database, the coincident curve length is extracted, and the conformity of the charging temperature change curve corresponding to the finished lithium battery is calculated, wherein the calculation formula is
Wherein
The curve conformity of the charging temperature variation of the finished lithium battery is expressed, F is the length of the coincidence of the charging temperature variation of the finished lithium battery, and F is the length of the standard charging temperature variation curve corresponding to the model of the finished lithium battery.
10. The machine vision-based online monitoring and analyzing system for production quality of power lithium batteries, according to claim 1, is characterized in that: the corresponding comprehensive production quality coefficient calculation formula of the finished lithium battery is as follows:
wherein eta is expressed as the corresponding comprehensive production quality coefficient of the finished lithium battery.
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